Fluorescein Ghosts

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Fluorescein is a popular chemical for flow visualization, and, as this video from Shanks FX demonstrates, it’s not hard to extract from highlighters if you’d like to experiment with it yourself. Fluorescein can also be purchased in powder form, but it’s typically rendered into a dye before use. When dripped into water, it can leave behind ghostly glowing wakes. Happy Halloween! (Video credit: Shanks FX)

In other news, I am back from my vacation! Thanks again to Claire from Brilliant Botany for looking out for everything while I was gone. – Nicole

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